JP2007032776A - Noise reducing structure for joint portion of flexible metal hose, and flexible metal hose - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a noise reducing structure of a joint portion of a flexible metal hose, and the flexible metal hose capable of reducing noise of a joint portion caused by flow of fluid while performing connecting work of the joint portion of the flexible metal hose in a short time with a simple constitution. <P>SOLUTION: In this noise reducing structure of the joint portion, a silencer 1 for reducing noise generated by the flow of fluid is fitted and mounted inside of the joint portion communicated with a metallic corrugated pipe 16 or in a fluid flow channel adjacent to the joint portion, in the joint portion 14 of the flexible metal hose for connecting the flexible metal hose 10 including the metallic corrugated pipe 16 having the fluid flow channel P inside, and piping 12 connected with the flexible metal hose. The silencer 11 is composed of sintered alloy molding. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a silencer structure for a joint portion of a flexible metal hose that performs joint connection between a flexible metal hose for piping for supplying pressure fluid and various pipes, and the flexible metal hose.

  Conventional flexible metal hoses consist of a thin-walled stainless steel bellows tube, fittings, and in some cases, blades added to it, and if the sound generated inside the flexible metal hose is loud, a soundproof mat or the like is placed around the outer circumference of the flexible metal hose. The sound is reduced by the winding method. Similarly, a proposal as disclosed in Patent Document 1 which discloses a structure for preventing vibration and sound of a metal corrugated tube has been made.

JP 2001-289378 (paragraph number 0011, FIG. 1)

  In the conventional metal corrugated pipe of Patent Document 1, the inner pipe 3 having the same diameter as that of the pipe 4 to be connected is inserted into the outer pipe 2 made of the corrugated pipe, and the hollow portion 7 is interposed between the two pipes. Is provided to form a corrugated tube portion 1 and welded and fixed to a pipe having both end edges of the corrugated tube portion arranged on both sides. However, in the structure of this patent document 1, inner pipes having the same diameter as the pipes on both sides to be connected to the inner pipe are prepared, the ends of these pipes are butted and welded together, and the inner pipe is further watertight. Since the corrugated pipe is sheathed so as to cover the pipe, it is easy to perform welding by aligning the pipes on both sides at the same longitudinal position while forming an airtight gap between the inner and outer pipes by welding. In addition, there is a problem that work time and labor for connection are required and work efficiency is extremely inferior. Furthermore, in the apparatus of this patent document 1, since it is the structure which wound the soundproof material, such as glass wool, in the inside of the cavity part 7 or the outer surface side of the outer tube 2, these soundproof materials were filled before and after those operations. Filling work is necessary and complicated after or after the situation. If the inside of the corrugated tube is filled with glass wool, etc., the welded portion rusts, breaks or is damaged, they are mixed into the fluid, and furthermore, when wound outside the corrugated tube However, there is a problem that dust and the like are likely to float at the time of work, and cannot be employed particularly in application scenes where cleanliness is required. Further, the inner pipe 3 having the same diameter as the pipes 4 on both sides secures spaces 3b, 3b for expanding and contracting the gripping edges 3a, 3a provided by bending the side edges alternately up and down, for example, at the pockets thereof. Then, the adjacent pipes are sequentially held and connected, and although the inner tube itself does not absorb or mute the sound, the manufacturing process is complicated and the cost is high.

  The present invention has been made in view of the above-described conventional problems, and one object of the present invention is to provide the flexible metal hose by the flow of fluid while performing a connection operation of the joint portion of the flexible metal hose in a short time with a simple configuration. An object of the present invention is to provide a sound deadening structure for a joint part of a flexible metal hose that can reduce the noise of the joint part, and a flexible metal hose thereof. Another object of the present invention is to provide a silencer structure for a joint portion of a flexible metal hose capable of smoothly and quickly connecting and connecting a hose and a pipe without generating dust or dust during operation, and its flexible metal. To provide a hose.

  In order to achieve the above object, the present invention connects a flexible metal hose 10 including a metal corrugate pipe 16 having a fluid flow path P therein and a pipe 12 connected to the flexible metal hose 10. A silencer 11 that reduces noise generated by the flow of fluid in the fluid passage P in or near the joint portion 14 communicating with the metal corrugate pipe 16 in the joint portion 14 of the flexible metal hose to be connected. It is comprised from the silencing structure of the joint part of the flexible metal hose characterized by having arrange | positioned.

  At that time, the silencer 11 is preferably made of metal and has a cylindrical outer contour and is disposed so as to close the flow path so that the sound is silenced when the fluid passes therethrough. Generally, the fluid flow path is structurally circular in cross section, and is arranged in a fitting shape so that a single silencer structure can be easily attached to and detached from the joint portion or a flexible metal hose in the vicinity thereof.

  In this case, the silencer body of the silencer 11 is preferably made of a sintered alloy structure, and since one porous rigid body is attached and detached and handled, the attachment work is simple and quick. In addition, the number of parts is small, management is easy, there are few failures, and maintenance is easy.

  Further, the silencer 11 may be detachable as the joint portion 14 is coupled / separated.

Further, the joint portion 14 includes a hose side directly connected pipe 20 that is bonded and fixed to the metal corrugate pipe 16 in the axial direction,
The silencer 11 may be inserted and arranged in the metal corrugate pipe 16 in a state where a part of the silencer 11 is joined and fixed to the hose side direct connection pipe 20, so that the silencer can be easily attached in a short time.

  Moreover, this invention is comprised from the flexible metal hose used for the sound deadening structure of the joint part of said flexible metal hose.

  According to the sound deadening structure of the joint portion of the flexible metal hose of the present invention, the flexible metal hose including the metal corrugate pipe having the fluid flow path therein and the pipe connected to the flexible metal hose are connected to each other. In the joint portion of the flexible metal hose, a silencer for reducing noise generated by the flow of fluid is fitted and arranged in the fluid passage in or near the joint portion communicating with the metal corrugate pipe Therefore, it is possible to reduce the noise of the joint portion of the flexible metal hose due to the flow of the fluid while performing the connection operation of the joint portion of the flexible metal hose in a short time with a simple operation of fitting and arranging the silencer.

  The metal silencer is made of metal and has a cylindrical outer contour, and is arranged so as to close the flow path so that the sound is silenced when the fluid permeates. The mounting state of the muffler without backlash can be maintained by using the stepped portion formed in, and the mounting operation is easy and the connecting operation time of the joint portion can be shortened.

  In addition, by making the silencer body part of the silencer a structure made of a sintered alloy structure, the sintered metal alloy structure has a reliable and stable silencer function, and the structure of the silencer is simple, Furthermore, attachment to and removal from the joint portion can be easily performed in a short time, and manufacturing and maintenance costs can be kept low. Moreover, in the case of piping used in a high temperature state, heat resistance can be added by using a metal silencer. Furthermore, by using a sintered alloy in a metal silencer in places and devices that do not like dust, it is possible to eliminate dust contamination and wear, satisfy the cleanliness of the flexible metal hose, and achieve maintenance-free operation.

  Moreover, since the silencer can be attached and detached along with the joint connection / separation of the joint portion, the connection work of the joint portion of the flexible metal hose is performed in a short time with a simple operation of fitting and arranging the silencer. The noise of the joint part of the flexible metal hose due to the fluid flow can be reduced.

  In addition, the joint portion includes a hose-side direct connection pipe that is axially fixed to the metal corrugate pipe, and the silencer is inserted and arranged in the metal corrugate pipe in a state where a part is bonded and fixed to the hose-side direct connection pipe. With this configuration, for example, a cylindrical silencer is mounted in a flexible metal hose in a state where it is connected to a joint fitting as a joint by welding, so mounting of the silencer to the flexible metal hose is short. It can be done in time and production time can be reduced. In addition, unlike the case where the silencer is inserted into the thin stainless steel corrugate pipe, it is possible to reduce or disturb the flow of the internal fluid that directly hits the stainless corrugate pipe, unlike the case where the silencer is attached to the fitting. Noise generated when a steady flow hits the metal corrugate inlet can be suppressed.

  Moreover, since this invention is comprised from the flexible metal hose used for the silencing structure of the joint part of the flexible metal hose of said structure, it is a joint of a flexible metal hose in a short time by the easy operation | work which carries out the fitting arrangement | positioning of a silencer. The noise around the joint portion of the flexible metal hose due to the flow of fluid can be reduced while performing the connecting operation of the portions.

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a partially cutaway side view illustrating a silencing structure of a joint portion of a flexible metal hose according to a first embodiment of the present invention. In the figure, a flexible metal hose 10 and a pipe 12 connected to the flexible metal hose 10 are arranged in series with the longitudinal direction of the flow path as the axis X direction, and are connected and connected between them. A joint portion 14 is disposed. The flexible metal hose 10 includes a thin metal corrugate pipe 16 formed of, for example, stainless steel peaks 2 and valleys 3, and a blade 18 attached to cover the outer surface side of the metal corrugate pipe 16. The blade 18 is coated on the outer surface of a metal corrugate tube, protects the corgate tube against an internal fluid pressure applied to the corgate tube, and reinforces strength against various external pressures. A hollow portion inside the corrugate tube forms a flow path P through which, for example, water, other liquids, gas, or the like flows. In a state where the pipe 12 and the flexible metal hose 10 are connected and connected by the joint portion 14, the internal flow path P and the outside are shut off in a watertight or airtight manner so that the fluid flowing through the inside does not leak to the outside. It has become.

  The joint portion 14 is a connecting means for connecting and connecting the flexible metal hose 10 and the pipe 12 connected to the flexible metal hose, and a fluid flow path between the inside of the flexible metal hose 10 and the inside of the pipe 12. P is connected in communication so that the fluid does not leak to the outside. In the present embodiment, the joint portion 14 includes a hose-side direct connection pipe 20 and a nipple pipe 22 that is screwed and connected to the hose-side direct connection pipe 20 in an axial series. In the present embodiment, the hose-side direct connection pipe 20 is composed of a stepped socket pipe in which a female thread portion is formed in the inner diameter portion 201 near one end opening, and a stepped portion 202 is formed at an intermediate position in the axial direction. The inner diameter portion 203 near the opening at the other end of the hose-side direct connection pipe 20 forms a smooth curved inner diameter portion that does not have a threaded portion, and is continuous to the minimum inner diameter side of the stepped wall 204 of the stepped portion. Further, the maximum inner diameter side of the step wall 204 is continuous with the inner diameter portion 201 near the opening at one end, and thus, a socket tube having a female screw inner diameter is formed via the stepped portion 202. The other end opening end face of the hose side direct connection pipe 20 is joined and fixed to the end part of the metal corrugate pipe 16 by welding or the like in a state where the blade 18 is sheathed. Further, in the present embodiment, a blade presser tube 23 is externally provided on the outer surface of the blade 18, and the end portions of the metal corrugate tube 16, the blade 18, and the blade presser tube 23 are common portions, and the hose side directly connected tube 20. The other end opening end face is welded and fixed (welded portion M). At this time, the inner diameter portion 203 of the hose side direct connection pipe 20 is set to a size that is substantially the same as the inner diameter line formed by the valley portion 3 of the metal corrugate pipe 16.

  The nipple tube 22 is a connecting tube member having a hooking corner portion 24 at the center portion on the outer surface side of the tube and screw portions 26a and 26b formed on both ends of the outer surface. The one-end-side male thread portion 26a is screwed and connected to the female thread portion of the inner diameter portion 201 that is the large-diameter side of the hose-side directly connected pipe. The other end side male threaded portion 26b of the nipple tube 22 is screwed to the arbitrary pipe 12 to be connected and fixed.

  In the present invention, one characteristic is that the silencer 11 for reducing noise generated by the flow of fluid is fitted and arranged inside the joint portion 14. In the embodiment, the inner diameter portion 221 of the nipple tube 22 forms the fluid flow path P. The screw connection side of the nipple tube 22 with the hose-side direct connection tube 20 is formed with a recessed portion 28 which is recessed in a stepped shape and has an enlarged inner diameter, whereby the recessed portion of the nipple tube 22 is formed. A concave portion (expanded diameter portion) 30 having a U-shaped cross section is formed in a portion surrounded by the stepped wall 204 of the hose side direct connection pipe 20. The silencer 11 is fitted and disposed in the recess 30. The U-shaped concave portion 30 is a separation and connection portion of the joint portion, and forms a fitting receiving portion of the silencer 11 that allows the silencer 11 to be mounted without looseness and to be detached and removed during the separation and connection. The silencer 11 is a silencer for reducing noise generated when a fluid flows in the fluid passage in or near the joint portion communicating with the metal corrugate pipe. The muffler 11 is fitted and fixed in a recess 30 formed by screwing connection between the hose side direct connection pipe 20 and the nipple pipe 22. In the present embodiment, the silencer 11 is made of metal, has a cylindrical outer contour, is arranged so as to close the flow path P, and is configured to mute the fluid when it passes therethrough. More specifically, as shown in FIG. 2, the silencer 11 of the present embodiment is formed of a hollow bottomed cylindrical body, and the silencer main body portion is formed of an integrally molded structure made of a sintered alloy. That is, the silencer of the embodiment is a porous metal sintered body in which, for example, copper alloy metal powder or metal dust particles are bonded by heating, so that when fluid passes through the silencer 11, Absorbs noise and prevents external noise generation. In the embodiment, the end surface 33 of the peripheral wall portion 32 of the silencer 11 abuts on the step wall 29 of the recessed portion 28 of the nipple tube 22, and there is no rattling in the state where the bottom portion 35 abuts against the step wall 204 of the hose side direct connection tube 20. Thus, it is fixedly fitted in the joint portion 14. In this way, the silencer 11 is an integrally molded structure made of a sintered alloy, and the silencer is fitted so that it can be attached and detached together with the joint connection / separation of the joint portion. Sintered alloy structure provides a reliable and stable sound deadening function, the structure of the silencer is simple, and it can be easily attached to and detached from the joint in a short time, and the manufacturing and maintenance costs are low. Can hold. Moreover, since the silencer 11 is mounted in a joint fitting as a joint portion, the mounting time on the flexible metal hose is short, the replacement of the silencer is simplified, and the manufacturing time can be shortened.

  The configuration of the silencer 11 is not limited to the configuration described above, and a silencer having a sound absorbing or silencing function may be applied by being incorporated in the joint portion. Preferably, a porous integrally molded structure is preferable. Furthermore, it is preferable that dust or peeling pieces are not generated during installation or use.

  Next, the sound deadening structure of the joint portion of the flexible metal hose according to the second embodiment of the present invention will be described with reference to FIG. 3, but the same members as those in the first embodiment will be denoted by the same reference numerals and detailed description thereof will be omitted. To do. In the silencing structure of the joint part of the flexible metal hose of the second embodiment, the structure of the joint part 14 is different from that of the first embodiment. Also in this embodiment, the silencer 11 is arranged in a state of being housed and accommodated in the joint portion 14. In the second embodiment, a nipple tube having a threaded portion formed on one outer surface of the corner portion 24 is a hose-side directly connected tube 20, and one end side of which is a metal corrugate tube 16, a blade 18, and a blade presser tube. At the welding position where the end portions of 23 are made common, they are fixedly welded together.

  In the present embodiment, the joint portion 14 includes a hose side direct connection pipe 20 formed of a nipple pipe, a coupler 38 that is sequentially connected in series to the hose side direct connection pipe 20, and an adapter 40. It connects so that the internal flow path P may be connected. The coupler 38 and the adapter 40 are known combination pipe members that can be instantly attached and detached by inserting the adapter 40 into the coupler 38.

  In the present embodiment, the male thread portion of the hose side direct connection pipe 20 and the one end opening side of the coupler 38 are coupled by screwing male and female screws, and the coupling portions are respectively attached to the inner peripheral portion of the coupler 38. An end face of the peripheral wall portion 32 of the silencer 11 having a lower cylinder is in contact with and fixed to the stopper ring 42. Further, the bottom portion 35 of the silencer 11 abuts against the third step wall 44 cut out in a U shape at the inner peripheral portion 211 of the hose-side direct connection pipe 20, and thereby enters the U-shaped recess 60 formed. The low-cylindrical silencer is fitted and fixed without rattling. As in the first embodiment, the silencer 11 is a silencer that reduces noise generated when fluid flows through the fluid flow path. In this embodiment, the silencer 11 is also made of metal and has a cylindrical outer contour. The flow path P is arranged so as to be closed, and is silenced when the fluid permeates through it. Further, the silencer 11 is formed of a hollow bottomed cylindrical body, and the silencer main body portion is formed of an integrally molded structure of a sintered alloy. As a result, when the fluid passes through the silencer 11, the sound is absorbed and noise is not generated outside. As a result, the same effects as those of the first embodiment can be obtained. That is, when the fluid passes through the silencer 11, the sound is absorbed and noise is not generated outside. Further, since the silencer 11 is built in the occlusal connection portion between the hose side direct connection tube 20 formed of a nipple tube and the inner peripheral portion of the occlusion tube portion 41 of the coupler 38, the attachment and detachment to the joint portion is short in time. Can be easily performed, and manufacturing and maintenance costs can be kept low. Moreover, since the silencer 11 is mounted in a joint fitting as a joint portion, the mounting time on the flexible metal hose is short, the replacement of the silencer is simplified, and the manufacturing time can be shortened. Moreover, since the silencer 11 is an integrally molded structure made of a sintered alloy, and the silencer is fitted so that it can be attached / detached with the joint connection / separation of the joint portion, the metal sintered alloy structure It has a reliable and stable mute function by the body.

  Next, the sound deadening structure of the joint portion of the flexible metal hose according to the third embodiment of the present invention will be described with reference to FIG. 4, but the same members as those in the first embodiment will be denoted by the same reference numerals and detailed description thereof will be omitted. To do. In the sound deadening structure of the joint portion of the flexible metal hose according to the third embodiment, the joint portion 14 is welded in common with the metal corrugate tube 16, the blade 18, and the end of the blade presser tube 23. It consists only of the hose side direct connection pipe 20 consisting of a nipple pipe having one end welded and fixed at the part M. A male thread portion is formed on the outer surface of the other end of the hose-side direct connection pipe 20 and is connected to another pipe 12 (not shown).

  In the third embodiment, the silencer 11 is inserted and disposed in the metal corrugate pipe 16 in a state in which a part is joined and fixed to the hose side direct connection pipe 20. Specifically, the hose side direct connection pipe 20 as the joint pipe 14 of the present embodiment includes a nipple pipe having a corner portion 24 for fastening fasteners at the center and a threaded portion on the outer surface. The outer surface portion on the connection side with the metal corrugate tube side forms a cutout portion 46 that is partially cut out in an L shape, and the metal corrugate tube 16 and the blade 18 are formed on the stepped wall 48 of the cutout portion 46. Are fixed by welding in a state where the end portions of the blade presser tube 23 are commonly applied (welded portion M). Therefore, the small outer diameter protruding cylinder portion 50 corresponding to the notch length of the notch portion 46 is inserted into the metal corrugate pipe 16, and the insertion end face 51 and the same as in the first embodiment. The end surface of the peripheral wall portion 32 of the silencer 11 of the integrally molded structure made of a sintered alloy is abutted and fixed by welding. The bottom part 35 of the silencer 11 is arranged so as to close the flow path in the metal corrugate pipe and the joint part 14, and the sound is absorbed or silenced by the porous holes when the fluid flows through the bottom part. . In this embodiment as well, it is possible to achieve the same operational effects as in the first embodiment. For example, the silencer 11 is a structure made of a sintered alloy, and a reliable and stable sound deadening is achieved by a metal sintered alloy structure. In addition to having a function, the structure of the silencer is simple, and it can be easily attached to and detached from the joint in a short time, and the manufacturing and maintenance costs can be kept low. In particular, in the present embodiment, the cylindrical silencer 11 is mounted in the flexible metal hose 10 in a state where the cylindrical silencer 11 is connected to a joint fitting as the joint portion 14 by welding, and thus the silencer 11 is mounted on the flexible metal hose 10. Can be done in a short time and the production time can be reduced. In addition, unlike the case where the silencer is inserted into the thin stainless steel corrugate pipe, it is possible to reduce or disturb the flow of the internal fluid that directly hits the stainless corrugate pipe, unlike the case where the silencer is attached to the fitting. Noise generated when a steady flow hits the metal corrugate inlet can be suppressed. For example, in FIG. 4, when the fluid flows in the direction of the arrow from the left to the right, compared to the case where the silencer 11 is not present, the flow may be reduced to some extent in the porous metal sintered body. At this time, the sound is absorbed by the sound absorbing function, so that no sound is generated due to fluctuations in the shape of the flow path when flowing directly from the metal joint into the metal corrugate pipe, so that effective sound absorption or silencing is realized. Moreover, in the case of piping used in a high temperature state, heat resistance can be added by using a metal silencer. In addition, in places and devices that do not like dust, the use of sintered alloys in metal silencers eliminates dust contamination and wear during filter construction, which satisfies the cleanliness of flexible metal hoses and makes maintenance free. I can plan.

  The silencing structure of the joint part of the flexible metal hose of the present invention described above and the flexible metal hose are not limited to the above-described embodiments, and do not depart from the essence of the present invention described in the claims. Any modification may be made.

  The sound deadening structure of the joint part of the flexible metal hose of the present invention and the flexible metal hose are used as the sound deadening structure of the pipe joint part for piping of gas, other gas, liquid, etc. using the flexible metal hose, or the flexible metal hose thereof. Can be widely applied.

It is a semi-circular cross-sectional explanatory drawing which shows the silencing structure of the joint part of the flexible metal hose which concerns on 1st Embodiment of this invention. It is an expansion perspective view of the silencer of FIG. It is a semi-cylindrical cross-section explanatory drawing which shows the sound deadening structure of the joint part of the flexible metal hose which concerns on 2nd Embodiment of this invention. It is a semi-cylindrical cross-section explanatory drawing which shows the sound deadening structure of the joint part of the flexible metal hose which concerns on 2nd Embodiment of this invention.

Explanation of symbols

10 Flexible Metal Hose 11 Silencer 12 Piping 14 Joint
16 Metal corrugate pipe 18 Blade 20 Hose side direct connection pipe 22 Nipple pipe P Fluid flow path M Welded part

Claims (6)

In a joint part of a flexible metal hose that connects and connects a flexible metal hose including a metal corrugate pipe having a fluid flow path therein, and a pipe connected to the flexible metal hose,
A flexible metal hose characterized in that a silencer for reducing noise generated by a fluid flow is fitted and disposed in a fluid flow path in or near the joint portion communicating with a metal corrugate pipe Silence structure of the joint.   2. The flexible metal according to claim 1, wherein the silencer is made of metal and has a cylindrical outer shape and is arranged so as to close the flow path so that the sound is silenced when fluid passes therethrough. Silence structure of hose joints.   The silencing structure for a joint portion of a flexible metal hose according to claim 1 or 2, wherein the silencing main body of the silencer is made of a sintered alloy structure.   The silencer structure for a joint part of a flexible metal hose according to any one of claims 1 to 3, wherein the silencer is detachable in accordance with joint connection / separation of the joint part. The joint portion includes a hose side directly connected pipe that is bonded and fixed to the metal corrugate pipe in the axial direction,
The joint part of the flexible metal hose according to any one of claims 1 to 4, wherein the silencer is inserted and arranged in a metal corrugate pipe in a state where a part thereof is joined and fixed to the hose side direct connection pipe. Silence structure. The flexible metal hose used for the sound deadening structure of the joint part of the flexible metal hose in any one of Claims 1 thru | or 5.

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